Titi
Reputation: 172
D3 multiple Axis interpolation
I am working on a project to plot a stream of csv/Json data (bar chart) where the order of arrival of the data is important. The Y axis is unique, but there are multiple X axes that correspond to different measures of the data. I am having trouble producing a nice graph that looks like this, given the following data:
x0,x1,x2,y,idx
-1,z,w2,10,0
0,z,w2,9,1
1,z,w2,8,2
-1,k,w2,11,3
0,k,5q,5,4
1,k,5q,8,5
idx represent the order the data arrives in.
this is what I get
X=["idx","x0","x1","x2"];
Y=["y"];
var margin = {
top: 80,
right: 180,
bottom: 180,
left: 180
},
width = 960 - margin.left - margin.right,
height = 500 - margin.top - margin.bottom;
var y = d3.scale.linear()
.range([height, 0]);
var xAxis = [],
x = [];
var x_uid = d3.scale.ordinal()
.rangeRoundPoints([0, width]);
for (var idx = 0; idx < X.length; idx++) {
x[idx] = d3.scale.ordinal()
.rangeRoundPoints([0, width]);
xAxis[idx] = d3.svg.axis()
.scale(x[idx])
.orient("bottom");
}
var yAxis = d3.svg.axis()
.scale(y)
.orient("left");
// .ticks(8, "%");
var svg = d3.select("body").append("svg")
.attr("width", width + margin.left + margin.right)
.attr("height", height + margin.top + margin.bottom)
.append("g")
.attr("transform", "translate(" + margin.left + "," + margin.top + ")");
var data = [{
x0:-1,
x1:z,
x2:w2,
y:10,
idx:0
},
{
x0:0,
x1:z,
x2:w2,
y:10,
idx:1
},
{
x0:1,
x1:z,
x2:w2,
y:10,
idx:2
},
{
x0:-1,
x1:j,
x2:w2,
y:10,
idx:3
},
{
x0:0,
x1:j,
x2:5q,
y:10,
idx:4
},
{
x0:1,
x1:j,
x2:5q,
y:10,
idx:5
}]
if(data) {
for (var idx = 0; idx < X.length; idx++) {
x[idx].domain(data.map(function(d) {
return d[X[idx]];
}));
}
x_uid.domain(data.map(function(d) {
return d.idx;
}));
y.domain([0, d3.max(data, function(d) {
d.value = d[Y[0]];
return d.value;
})]);
for (var idx = 0; idx < X.length; idx++)
svg.append("g")
.attr("class", "x axis")
.attr("transform", "translate(0," + (height + idx * 25) + ")")
.call(xAxis[idx]);
svg.append("g")
.attr("class", "y axis")
.call(yAxis);
svg.selectAll(".bar")
.data(data)
.enter().append("rect")
.attr("class", "bar")
.attr("x", function(d) {
return x_uid(d.idx);
})
.attr("width", 1)
.attr("y", function(d) {
return y(d.value);
})
.attr("height", function(d) {
return height - y(d.value);
});
});<script src="https://cdnjs.cloudflare.com/ajax/libs/d3/3.4.6/d3.min.js"></script>
<div id="chart"></div>
Offsetting the ticks' text is not an issue, but I am having problems with the interpolation due to the multiplicities of the values: e.g. width of w2 > width of 5q e.g. x0 axis should be -1 0 1 -1 0 1 but d3 interpolates as -1 0 1 I tried using rangeRoundBand instead of rangeRoundPoint but the issue is similar. I also tried playing around with tickValues but to no avail. I tried doing my own interpolation using linear scales instead of ordinal, but it becomes very messy very quickly because is forces me to manually calculate and adjust all the ticks' positions and texts while taking into account the d3.behavior zoom level etc...
function adjustTickPosition(selection, count, scale, translate, rotate) {
//selection = axis
//count = multiplicity of each tick
//scale = d3.behavior.zoom scale
//translate = d3.behavior.zoom translation
//rotate = irrelevent here (additional styling)
console.info( selection.selectAll("g.tick"))
// cancel previous position
//
// /!\ For some reason there is always 100 ticks instead of the appropriate number
//
selection.selectAll("g.tick")
.attr("transform", "translate(0,0)");
// align tick marks
selection.selectAll("g.tick line")
.attr('transform', function (d, k) {
if (k <= count.length - 1) {
var newPosition = scaleTranslate(count[k]);
if (newPosition > width || newPosition < 0) {
d3.select(this.parentNode).style("visibility", "hidden");
} else
d3.select(this.parentNode).style("visibility", "visible");
return 'translate(' + newPosition + ',0)';
} else
return 'translate(0,0)';
});
// offset tick label compared to tick marks
selection.selectAll("g.tick text")
.attr('transform', function (d, k) {
if (k <= count.length - 1) {
var pos, transform;
if (k > 0) pos = (count[k - 1] + count[k]) / 2;
else pos = count[k] / 2;
var newPosition = scaleTranslate(pos);
if (newPosition > width || newPosition < 0) {
d3.select(this.parentNode).style("visibility", "hidden");
} else
d3.select(this.parentNode).style("visibility", "visible");
var transform = 'translate(' + newPosition + ',0)';
if (rotate) transform += ' rotate(-65)';
return transform;
} else
return 'translate(0,0)';
});
if (rotate) selection.selectAll("g.tick text").style("text-anchor", "end")
.attr("dx", "-.8em")
.attr("dy", ".15em");
return selection;
function scaleTranslate(v) {
return v / count[count.length - 1] * width * scale + translate[0];
}
}Could someone please show me how to properly use axes ticks for this kind of purpose?
Thank you in advance
Upvotes: 1
Views: 422
Answers (1)
Titi
Reputation: 172
I made my own class/object because d3 was apparently not meant for this kind of graph
function chartAxis(key, args) {
//***************************
// PRIVATE
//***************************
var _direction = args ? (args.direction || "x") : "x";
var _width = args ? (args.width || 500) : 500;
var _alignTicks = args ? (args.alignTicks || false) : false;
var _tickSize = args ? (args.tickSize || 0) : 0;
var _numTicks = args ? (args.numTicks || 10) : 10;
var _offset = args ? (args.offset || 25) : 25;
var _zoom = args ? (args.zoom || {
s: 1,
t: 0
}) : {
s: 1,
t: 0
};
var _totalLength;
function consecutiveReduction(list, key) {
var Bin = function (val, cnt) {
return {
value: val,
count: cnt,
cumulativeCount: 0,
center: 0,
position: 0
};
};
var result = list.map(function (d) {
return key ? d[key] : d;
}).reduce(function (acc, d) {
var currentBin = acc[acc.length - 1];
if ((acc.length > 0) && d === currentBin.value) {
//add to current bin
currentBin.count++;
} else {
//create new bin
acc.push(new Bin(d, 1));
}
return acc;
}, []);
result.forEach(accumulate);
result.forEach(positionTick);
return result;
}
function positionTick(d) {
d.position = ApplyZoom(d.cumulativeCount);
d.center = _alignTicks ? d.position : ApplyZoom(d.cumulativeCount - d.count / 2);
function ApplyZoom(val) {
var translate;
if (_zoom.t.length > 1)
translate = (_direction == "x") ? _zoom.t[0] : _zoom.t[1];
else
translate = _zoom.t;
return val / _totalLength * _width * _zoom.s + translate;
}
}
function accumulate(d, i, arr) {
d.cumulativeCount = d.count;
if (i > 0) d.cumulativeCount += arr[i - 1].cumulativeCount;
}
//***************************
// PUBLIC
//***************************
var xAxis = function (selection) {
selection.each(function (data) {
// calculate
_totalLength = data.length;
var tickData = consecutiveReduction(data, key);
console.log(tickData.map(function (d) {
return d.count
}))
console.table(data,key)
//create parent axis with clip-path
var axis = d3.select(this)
.attr("id", key);
axis.selectAll("#clipAxis-" + key).data([1]).enter()
.append("clipPath")
.attr("id", "clipAxis-" + key)
.append("svg:rect")
.attr("x", 0)
.attr("y", _offset - _tickSize)
.attr("width", _width)
.attr("height", 25 + _tickSize);
// Axis line and label
var axisLine = axis.selectAll(".axisLine").data([1]).enter();
axisLine.append("line").attr({
x1: 0,
y1: _offset,
x2: _width,
y2: _offset,
class: "axisLine"
});
axisLine.append("text")
.text(key)
.attr({
x: _width + 10,
y: _offset
}).style("text-anchor", "start");
// tick on the axis
var ticks = axis.selectAll("g.tick")
.data(tickData);
// ENTER
var newticks = ticks.enter().append("g").attr("class", "tick");
newticks.append("line");
newticks.append("text");
// UPDATE
ticks.attr("clip-path", "url(#clipAxis-" + key + ")");
ticks.select(".tick line")
.attr("x1", function (d) {
return d.position
})
.attr("x2", function (d) {
return d.position
})
.attr("y1", function (d) {
return _offset - _tickSize
})
.attr("y2", function (d) {
return _offset + 5
});
ticks.select(".tick text")
.text(function (d) {
return d.value;
})
.attr("x", function (d) {
return d.center;
})
.attr("y", function (d) {
return _offset + 10;
})
.style("text-anchor", "middle")
.style("text-length", function (d) {
return (0.6 * 2 * (d.position - d.center)) + "px";
});
// EXIT
ticks.exit().remove();
})
};
var yAxis = function (selection) {
selection.each(function (data) {
// calculate
_totalLength = data.length;
var tickData = d3.extent(data, function (d) {
return d[key];
});
var tickRange = (tickData[1] - tickData[0]) / (_numTicks - 4 + 1); // -4 -> [0.85*min min ... max 1.15*max]
console.log(tickData.map(function (d) {
return d.count
}))
console.log(_tickSize)
//create parent axis with clip-path
var axis = axisLine = d3.select(this)
.attr("id", key);
axis.selectAll("#clipAxis-" + key).data([1]).enter()
.append("clipPath")
.attr("id", "clipAxis-" + key)
.append("svg:rect")
.attr("x", _offset)
.attr("y", 0)
.attr("width", _width)
.attr("height", 25 + _tickSize);
// Axis line and label
axisLine = axis.selectAll(".axisLine").data([1]).enter();
axisLine.append("line").attr({
x1: _offset,
y1: 0,
x2: _offset,
y2: _width,
class: "axisLine"
});
axisLine.append("text")
.text(key)
.attr({
x: _offset,
y: -10
}).style("text-anchor", "start");
// tick on the axis
var ticks = axis.selectAll("g.tick")
.data(tickData);
// ENTER
var newticks = ticks.enter().append("g").attr("class", "tick");
newticks.append("line");
newticks.append("text");
// UPDATE
ticks.attr("clip-path", "url(#clipAxis-" + key + ")");
ticks.select(".tick line")
.attr("x1", function (d) {
return _offset - 5
})
.attr("x2", function (d) {
return _offset + _tickSize
})
.attr("y1", function (d) {
return d.position
})
.attr("y2", function (d) {
return d.position
});
ticks.select(".tick text")
.text(function (d) {
return d.value;
})
.attr("x", function (d) {
return _offset + 10;
})
.attr("y", function (d) {
return d.center;
})
.style("text-anchor", "middle")
.style("text-length", function (d) {
return (0.6 * 2 * (d.position - d.center)) + "px";
});
// EXIT
ticks.exit().remove();
}); // end select.foreach
}; // end yAxis
xAxis.BindToZoom = function (zoomObject) {
_zoom = zoomObject;
return xAxis;
}
yAxis.BindToZoom = function (zoomObject) {
_zoom = zoomObject;
return yAxis;
}
return (_direction == "x") ? xAxis : yAxis;
}Usage:
function chartAxis(key, args) {
//***************************
// PRIVATE
//***************************
var _direction = args ? (args.direction || "x") : "x";
var _width = args ? (args.width || 500) : 500;
var _alignTicks = args ? (args.alignTicks || false) : false;
var _tickSize = args ? (args.tickSize || 0) : 0;
var _numTicks = args ? (args.numTicks || 10) : 10;
var _offset = args ? (args.offset || 25) : 25;
var _zoom = args ? (args.zoom || {
s: 1,
t: 0
}) : {
s: 1,
t: 0
};
var _totalLength;
function consecutiveReduction(list, key) {
var Bin = function(val, cnt) {
return {
value: val,
count: cnt,
cumulativeCount: 0,
center: 0,
position: 0
};
};
var result = list.map(function(d) {
return key ? d[key] : d;
}).reduce(function(acc, d) {
var currentBin = acc[acc.length - 1];
if ((acc.length > 0) && d === currentBin.value) {
//add to current bin
currentBin.count++;
} else {
//create new bin
acc.push(new Bin(d, 1));
}
return acc;
}, []);
result.forEach(accumulate);
result.forEach(positionTick);
return result;
}
function positionTick(d) {
d.position = ApplyZoom(d.cumulativeCount);
d.center = _alignTicks ? d.position : ApplyZoom(d.cumulativeCount - d.count / 2);
function ApplyZoom(val) {
var translate;
if (_zoom.t.length > 1)
translate = (_direction == "x") ? _zoom.t[0] : _zoom.t[1];
else
translate = _zoom.t;
return val / _totalLength * _width * _zoom.s + translate;
}
}
function accumulate(d, i, arr) {
d.cumulativeCount = d.count;
if (i > 0) d.cumulativeCount += arr[i - 1].cumulativeCount;
}
//***************************
// PUBLIC
//***************************
var xAxis = function(selection) {
selection.each(function(data) {
// calculate
_totalLength = data.length;
var tickData = consecutiveReduction(data, key);
//create parent axis with clip-path
var axis = d3.select(this)
.attr("id", key);
axis.selectAll("#clipAxis-" + key).data([1]).enter()
.append("clipPath")
.attr("id", "clipAxis-" + key)
.append("svg:rect")
.attr("x", 0)
.attr("y", _offset - _tickSize)
.attr("width", _width)
.attr("height", 25 + _tickSize);
// Axis line and label
var axisLine = axis.selectAll(".axisLine").data([1]).enter();
axisLine.append("line").attr({
x1: 0,
y1: _offset,
x2: _width,
y2: _offset,
class: "axisLine"
});
axisLine.append("text")
.text(key)
.attr({
x: _width + 10,
y: _offset
}).style("text-anchor", "start");
// tick on the axis
var ticks = axis.selectAll("g.tick")
.data(tickData);
// ENTER
var newticks = ticks.enter().append("g").attr("class", "tick");
newticks.append("line");
newticks.append("text");
// UPDATE
ticks.attr("clip-path", "url(#clipAxis-" + key + ")");
ticks.select(".tick line")
.attr("x1", function(d) {
return d.position
})
.attr("x2", function(d) {
return d.position
})
.attr("y1", function(d) {
return _offset - _tickSize
})
.attr("y2", function(d) {
return _offset + 5
});
ticks.select(".tick text")
.text(function(d) {
return d.value;
})
.attr("x", function(d) {
return d.center;
})
.attr("y", function(d) {
return _offset + 10;
})
.style("text-anchor", "middle")
.style("text-length", function(d) {
return (0.6 * 2 * (d.position - d.center)) + "px";
});
// EXIT
ticks.exit().remove();
})
};
var yAxis = function(selection) {
selection.each(function(data) {
// calculate
_totalLength = data.length;
var tickData = consecutiveReduction(data, key);
//create parent axis with clip-path
var axis = axisLine = d3.select(this)
.attr("id", key);
axis.selectAll("#clipAxis-" + key).data([1]).enter()
.append("clipPath")
.attr("id", "clipAxis-" + key)
.append("svg:rect")
.attr("x", _offset)
.attr("y", 0)
.attr("width", _width)
.attr("height", 25 + _tickSize);
// Axis line and label
axisLine = axis.selectAll(".axisLine").data([1]).enter();
axisLine.append("line").attr({
x1: _offset,
y1: 0,
x2: _offset,
y2: _width,
class: "axisLine"
});
axisLine.append("text")
.text(key)
.attr({
x: _offset,
y: -10
}).style("text-anchor", "start");
// tick on the axis
var ticks = axis.selectAll("g.tick")
.data(tickData);
// ENTER
var newticks = ticks.enter().append("g").attr("class", "tick");
newticks.append("line");
newticks.append("text");
// UPDATE
ticks.attr("clip-path", "url(#clipAxis-" + key + ")");
ticks.select(".tick line")
.attr("x1", function(d) {
return _offset - 5
})
.attr("x2", function(d) {
return _offset + _tickSize
})
.attr("y1", function(d) {
return d.position
})
.attr("y2", function(d) {
return d.position
});
ticks.select(".tick text")
.text(function(d) {
return d.value;
})
.attr("x", function(d) {
return _offset + 10;
})
.attr("y", function(d) {
return d.center;
})
.style("text-anchor", "middle")
.style("text-length", function(d) {
return (0.6 * 2 * (d.position - d.center)) + "px";
});
// EXIT
ticks.exit().remove();
}); // end select.foreach
}; // end yAxis
xAxis.BindToZoom = function(zoomObject) {
_zoom = zoomObject;
return xAxis;
}
yAxis.BindToZoom = function(zoomObject) {
_zoom = zoomObject;
return yAxis;
}
return (_direction == "x") ? xAxis : yAxis;
}
var data = [{
"a": 1,
"b": 3,
c: 1
}, {
"a": 1,
"b": 3,
c: 2
}, {
"a": 1,
"b": 2,
c: 3
}, {
"a": 1,
"b": 3,
c: 4
}, {
"a": 2,
"b": 3,
c: 5
}, {
"a": 3,
"b": "a",
c: 6
}, {
"a": 1,
"b": "a",
c: 7
}];
X = ["b", "a", "c"];
var axesDOM = d3.select("svg")
.selectAll(".axis")
.data(X).enter()
.append("g").attr("class", "axis");
axesDOM.each(function(x, i) {
d3.select(this).datum(data)
.call(new chartAxis(x, {
width: 200,
offset: 25 + i * 25,
direction: "x"
}));
});<script src="https://cdnjs.cloudflare.com/ajax/libs/d3/3.4.11/d3.min.js"></script>
<svg width="200px" height="200px"></svg>Upvotes: 1
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